Effectiveness of 3D Geoelectrical Resistivity Imaging using Parallel 2D Profiles
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Abstract
Description
Acquisition geometry for 3D geoelectrical resistivity
imaging in which apparent resistivity data of a set of
parallel 2D profiles are collated to 3D dataset was
evaluated. A set of parallel 2D apparent resistivity
data was generated over two model structures. The
models, horst and trough, simulate the geological
environment of a weathered profile and refuse dump
site in a crystalline basement complex respectively.
The apparent resistivity data were generated for
Wenner–alpha, Wenner–beta, Wenner–Schlumberger,
dipole–dipole, pole–dipole and pole–pole arrays with
minimum electrode separation, a (a = 2, 4, 5 and 10 m)
and inter-line spacing, L (L = a, 2a, 2.5a, 4a, 5a and
10a). The 2D apparent resistivity data for each of the
arrays were collated to 3D dataset and inverted using
a full 3D inversion code. The 3D imaging capability
and resolution of the arrays for the set of parallel 2D
profiles are presented. Grid orientation effects are
observed in the inversion images produced. Inter-line
spacing of not greater than four times the minimum
electrode separation gives reasonable inverse models.
The resolution of the inverse models can be greatly
improved if the 3D dataset is built by collating sets of
orthogonal 2D profiles
Keywords
QC Physics